Double grip dumbbell



FIG. 1 is a front perspective view of a double grip dumbbell, showing my new design;

FIG. 2 is a left-side elevation view thereof, with a right-side elevation view being a mirror image thereof;

FIG. 3 is a front elevation view thereof, with a rear elevation view being a mirror image thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

CLAIM The ornamental design for a double grip dumbbell, as shown and described. 